Add Deprecated annotation to WebSecurity#securityInterceptor

Closes gh-11634

Author: marcusdacoregio

config/src/main/java/org/springframework/security/config/annotation/web/builders/WebSecurity.java

@@ -264,6 +264,7 @@ public WebInvocationPrivilegeEvaluator getPrivilegeEvaluator() {
 	 * @deprecated Use {@link #privilegeEvaluator(WebInvocationPrivilegeEvaluator)}
 	 * instead
 	 */
+	@Deprecated
 	public WebSecurity securityInterceptor(FilterSecurityInterceptor securityInterceptor) {
 		this.filterSecurityInterceptor = securityInterceptor;
 		return this;